Hello Phil,
I needed the same information as you to restrict our firewall accordingly.
Hope it will help you:
https://logit.api.intuit.com/v1/Logger (54.201.43.63)https://qb34fgocd.quickbooks.com/bin/onld/updatedir4.cgi (35.82.234.243)
https://tcontent.quickbooks.com/PingCompanyRq (54.149.180.33)
https://qfp.intuit.com/ (91.235.133.106)
https://deviceintel-identityra.api.intuit.com/v1/session/process (44.232.80.36)
https://intuitvisitorid.api.intuit.com/ (44.227.142.149)
https://eventbus.intuit.com/v2/segment/iip-identity-clickstream/t (44.231.253.63)
https://logging.api.intuit.com/v2/log/message (3.22.16.93)
Port is 443.
Best regards from Austria!
Julian
